Before removing tape backing from Spoiler, Center Spoiler in place on Glass, using small pieces of masking tape-painters tape, mark corners and center of spoiler on Glass, so you can use these reference points when laying spoiler in place.

Before removing tape backing from Spoiler, Center Spoiler in place on Glass, using small pieces of masking tape-painters tape, mark corners and center of spoiler on Glass, so you can use these reference points when laying spoiler in place.